Electrochromic display cell containing substituted...

Details Electrochromic display cell containing substituted... Electrochromic display cell containing substituted...

G - Physics

02

F

345/6, 96/8

G02F 1/13 (2006.01) G02B 5/14 (1980.01)

Patent

CA 1043890

ABSTRACT The invention relates to an image display cell which forms an image which persists if no longer current flows through the cell. The cell has at least two elec- trodes which a? in contact with a cell liquid in which a colourless viologen salt Image is dissolved. When a potential difference of at least 1.5 volts is applied across the electrodes the said salt is reduced to a coloured indissoluble compound which adheres to the cathode, thus colouring it and forming an image. At the anode the bromide is oxidized to bromine which complexes with a quaternary ammonium ion and precipitates on the anode.

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